摘要：

采用火焰喷涂法制备了低密度聚乙烯（LDPE）涂层和LDPE/纳米二氧化硅（n-SiO₂）复合涂层。利用差示扫描量热法（DSC）对涂层的非等温结晶行为进行研究，并用Jeziorny法和Mo法进行处理。结果表明，Jeziorny法和Mo法处理涂层的非等温结晶过程比较合理；Jeziorny法得到的结晶速率常数和Avrami指数均随冷却速率的增加而增加，且n-SiO₂的加入使复合涂层的结晶速率常数和Avrami指数略有升高、半结晶时间降低，结晶速率增大，表明n-SiO₂

Abstract:

The non-isothermal crystallization behavior of pure low-density polyethylene（LDPE） coating and LDPE/n-SiO₂ composite coating prepared by flame spraying was investigated by differential scanning calorimetry (DSC)at various cooling rates.The Avrami analysis modified by Jeziorny and Mo models could describe the non-isothermal crystallization process of LDPE and LDPE/n-SiO₂ composite coating successfully.The values of Z_c and n increased with increasing cooling rate.The values of Z_c and n of composite coatings containing nano-SiO₂ were higher than those of pure LDPE coating.The half-time values of crystallization showed that the crystallization rate of LDPE/n-SiO₂ composite coating was faster than that of pure LDPE coating at a given cooling rate.Furthermore, it was found that nano-SiO₂ in LDPE coating acted as an effective nucleation agent.